libmultipath/devmapper.c

   1 /*
   2  * snippets copied from device-mapper dmsetup.c
   3  * Copyright (c) 2004, 2005 Christophe Varoqui
   4  * Copyright (c) 2005 Kiyoshi Ueda, NEC
   5  * Copyright (c) 2005 Patrick Caulfield, Redhat
   6  */
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <libdevmapper.h>
  11 #include <ctype.h>
  12 #include <linux/kdev_t.h>
  13 #include <unistd.h>
  14
  15 #include <checkers.h>
  16
  17 #include "vector.h"
  18 #include "structs.h"
  19 #include "debug.h"
  20 #include "memory.h"
  21 #include "devmapper.h"
  22
  23 #define MAX_WAIT 5
  24 #define LOOPS_PER_SEC 5
  25
  26 static void
  27 dm_dummy_log (int level, const char *file, int line, const char *f, ...)
  28 {
  29         return;
  30 }
  31
  32 void
  33 dm_restore_log (void)
  34 {
  35         dm_log_init(NULL);
  36 }
  37
  38 void
  39 dm_shut_log (void)
  40 {
  41         dm_log_init(&dm_dummy_log);
  42 }
  43
  44 extern int
  45 dm_prereq (char * str, int x, int y, int z)
  46 {
  47         int r = 2;
  48         struct dm_task *dmt;
  49         struct dm_versions *target;
  50         struct dm_versions *last_target;
  51
  52         if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
  53                 return 3;
  54
  55         dm_task_no_open_count(dmt);
  56
  57         if (!dm_task_run(dmt)) {
  58                 condlog(0, "Can not communicate with kernel DM");
  59                 goto out;
  60         }
  61
  62         target = dm_task_get_versions(dmt);
  63
  64         do {
  65                 last_target = target;
  66
  67                 if (!strncmp(str, target->name, strlen(str))) {
  68                         r--;
  69
  70                         if (target->version[0] >= x &&
  71                             target->version[1] >= y &&
  72                             target->version[2] >= z)
  73                                 r--;
  74
  75                         break;
  76                 }
  77
  78                 target = (void *) target + target->next;
  79         } while (last_target != target);
  80
  81         if (r == 2)
  82                 condlog(0, "DM multipath kernel driver not loaded");
  83         else if (r == 1)
  84                 condlog(0, "DM multipath kernel driver version too old");
  85
  86 out:
  87         dm_task_destroy(dmt);
  88         return r;
  89 }
  90
  91 extern int
  92 dm_simplecmd (int task, const char *name) {
  93         int r = 0;
  94         struct dm_task *dmt;
  95
  96         if (!(dmt = dm_task_create (task)))
  97                 return 0;
  98
  99         if (!dm_task_set_name (dmt, name))
 100                 goto out;
 101
 102         dm_task_no_open_count(dmt);
 103
 104         r = dm_task_run (dmt);
 105
 106         out:
 107         dm_task_destroy (dmt);
 108         return r;
 109 }
 110
 111 extern int
 112 dm_addmap (int task, const char *name, const char *target,
 113            const char *params, unsigned long long size, const char *uuid) {
 114         int r = 0;
 115         struct dm_task *dmt;
 116
 117         if (!(dmt = dm_task_create (task)))
 118                 return 0;
 119
 120         if (!dm_task_set_name (dmt, name))
 121                 goto addout;
 122
 123         if (!dm_task_add_target (dmt, 0, size, target, params))
 124                 goto addout;
 125
 126         if (uuid && !dm_task_set_uuid(dmt, uuid))
 127                 goto addout;
 128
 129         dm_task_no_open_count(dmt);
 130
 131         r = dm_task_run (dmt);
 132
 133         addout:
 134         dm_task_destroy (dmt);
 135         return r;
 136 }
 137
 138 extern int
 139 dm_map_present (char * str)
 140 {
 141         int r = 0;
 142         struct dm_task *dmt;
 143         struct dm_info info;
 144
 145         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 146                 return 0;
 147
 148         if (!dm_task_set_name(dmt, str))
 149                 goto out;
 150
 151         dm_task_no_open_count(dmt);
 152
 153         if (!dm_task_run(dmt))
 154                 goto out;
 155
 156         if (!dm_task_get_info(dmt, &info))
 157                 goto out;
 158
 159         if (info.exists)
 160                 r = 1;
 161 out:
 162         dm_task_destroy(dmt);
 163         return r;
 164 }
 165
 166 extern int
 167 dm_get_map(char * name, unsigned long long * size, char * outparams)
 168 {
 169         int r = 1;
 170         struct dm_task *dmt;
 171         void *next = NULL;
 172         uint64_t start, length;
 173         char *target_type = NULL;
 174         char *params = NULL;
 175
 176         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 177                 return 1;
 178
 179         if (!dm_task_set_name(dmt, name))
 180                 goto out;
 181
 182         dm_task_no_open_count(dmt);
 183
 184         if (!dm_task_run(dmt))
 185                 goto out;
 186
 187         /* Fetch 1st target */
 188         next = dm_get_next_target(dmt, next, &start, &length,
 189                                   &target_type, &params);
 190
 191         if (size)
 192                 *size = length;
 193
 194         if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
 195                 r = 0;
 196 out:
 197         dm_task_destroy(dmt);
 198         return r;
 199 }
 200
 201 extern int
 202 dm_get_uuid(char *name, char *uuid)
 203 {
 204         struct dm_task *dmt;
 205         const char *uuidtmp;
 206
 207         dmt = dm_task_create(DM_DEVICE_INFO);
 208         if (!dmt)
 209                 return 1;
 210
 211         if (!dm_task_set_name (dmt, name))
 212                 goto uuidout;
 213
 214         if (!dm_task_run(dmt))
 215                 goto uuidout;
 216
 217         uuidtmp = dm_task_get_uuid(dmt);
 218         if (uuidtmp)
 219                 strcpy(uuid, uuidtmp);
 220         else
 221                 uuid[0] = '\0';
 222
 223 uuidout:
 224         dm_task_destroy(dmt);
 225
 226         return 0;
 227 }
 228
 229 extern int
 230 dm_get_status(char * name, char * outstatus)
 231 {
 232         int r = 1;
 233         struct dm_task *dmt;
 234         void *next = NULL;
 235         uint64_t start, length;
 236         char *target_type;
 237         char *status;
 238
 239         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 240                 return 1;
 241
 242         if (!dm_task_set_name(dmt, name))
 243                 goto out;
 244
 245         dm_task_no_open_count(dmt);
 246
 247         if (!dm_task_run(dmt))
 248                 goto out;
 249
 250         /* Fetch 1st target */
 251         next = dm_get_next_target(dmt, next, &start, &length,
 252                                   &target_type, &status);
 253
 254         if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
 255                 r = 0;
 256 out:
 257         if (r)
 258                 condlog(0, "%s: error getting map status string", name);
 259
 260         dm_task_destroy(dmt);
 261         return r;
 262 }
 263
 264 /*
 265  * returns:
 266  *    1 : match
 267  *    0 : no match
 268  *   -1 : empty map
 269  */
 270 extern int
 271 dm_type(char * name, char * type)
 272 {
 273         int r = 0;
 274         struct dm_task *dmt;
 275         void *next = NULL;
 276         uint64_t start, length;
 277         char *target_type = NULL;
 278         char *params;
 279
 280         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 281                 return 0;
 282
 283         if (!dm_task_set_name(dmt, name))
 284                 goto out;
 285
 286         dm_task_no_open_count(dmt);
 287
 288         if (!dm_task_run(dmt))
 289                 goto out;
 290
 291         /* Fetch 1st target */
 292         next = dm_get_next_target(dmt, next, &start, &length,
 293                                   &target_type, &params);
 294
 295         if (!target_type)
 296                 r = -1;
 297         else if (!strcmp(target_type, type))
 298                 r = 1;
 299
 300 out:
 301         dm_task_destroy(dmt);
 302         return r;
 303 }
 304
 305 static int
 306 dm_dev_t (char * mapname, char * dev_t, int len)
 307 {
 308         int r = 1;
 309         struct dm_task *dmt;
 310         struct dm_info info;
 311
 312         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 313                 return 0;
 314
 315         if (!dm_task_set_name(dmt, mapname))
 316                 goto out;
 317
 318         if (!dm_task_run(dmt))
 319                 goto out;
 320
 321         if (!dm_task_get_info(dmt, &info))
 322                 goto out;
 323
 324         r = info.open_count;
 325         if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
 326                     goto out;
 327
 328         r = 0;
 329 out:
 330         dm_task_destroy(dmt);
 331         return r;
 332 }
 333
 334 int
 335 dm_get_opencount (char * mapname)
 336 {
 337         int r = -1;
 338         struct dm_task *dmt;
 339         struct dm_info info;
 340
 341         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 342                 return 0;
 343
 344         if (!dm_task_set_name(dmt, mapname))
 345                 goto out;
 346
 347         if (!dm_task_run(dmt))
 348                 goto out;
 349
 350         if (!dm_task_get_info(dmt, &info))
 351                 goto out;
 352
 353         r = info.open_count;
 354 out:
 355         dm_task_destroy(dmt);
 356         return r;
 357 }
 358
 359 int
 360 dm_get_minor (char * mapname)
 361 {
 362         int r = -1;
 363         struct dm_task *dmt;
 364         struct dm_info info;
 365
 366         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 367                 return 0;
 368
 369         if (!dm_task_set_name(dmt, mapname))
 370                 goto out;
 371
 372         if (!dm_task_run(dmt))
 373                 goto out;
 374
 375         if (!dm_task_get_info(dmt, &info))
 376                 goto out;
 377
 378         r = info.minor;
 379 out:
 380         dm_task_destroy(dmt);
 381         return r;
 382 }
 383
 384 extern int
 385 dm_flush_map (char * mapname, char * type)
 386 {
 387         int r;
 388
 389         if (!dm_map_present(mapname))
 390                 return 0;
 391
 392         if (dm_type(mapname, type) <= 0)
 393                 return 1;
 394
 395         if (dm_remove_partmaps(mapname))
 396                 return 1;
 397
 398         if (dm_get_opencount(mapname)) {
 399                 condlog(2, "%s: map in use", mapname);
 400                 return 1;
 401         }
 402
 403         r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
 404
 405         if (r) {
 406                 condlog(4, "multipath map %s removed", mapname);
 407                 return 0;
 408         }
 409         return 1;
 410 }
 411
 412 extern int
 413 dm_flush_maps (char * type)
 414 {
 415         int r = 0;
 416         struct dm_task *dmt;
 417         struct dm_names *names;
 418         unsigned next = 0;
 419
 420         if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
 421                 return 0;
 422
 423         dm_task_no_open_count(dmt);
 424
 425         if (!dm_task_run (dmt))
 426                 goto out;
 427
 428         if (!(names = dm_task_get_names (dmt)))
 429                 goto out;
 430
 431         if (!names->dev)
 432                 goto out;
 433
 434         do {
 435                 r += dm_flush_map(names->name, type);
 436                 next = names->next;
 437                 names = (void *) names + next;
 438         } while (next);
 439
 440         out:
 441         dm_task_destroy (dmt);
 442         return r;
 443 }
 444
 445 int
 446 dm_message(char * mapname, char * message)
 447 {
 448         int r = 1;
 449         struct dm_task *dmt;
 450
 451         if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
 452                 return 1;
 453
 454         if (!dm_task_set_name(dmt, mapname))
 455                 goto out;
 456
 457         if (!dm_task_set_sector(dmt, 0))
 458                 goto out;
 459
 460         if (!dm_task_set_message(dmt, message))
 461                 goto out;
 462
 463         dm_task_no_open_count(dmt);
 464
 465         if (!dm_task_run(dmt))
 466                 goto out;
 467
 468         r = 0;
 469 out:
 470         if (r)
 471                 condlog(0, "DM message failed [%s]", message);
 472
 473         dm_task_destroy(dmt);
 474         return r;
 475 }
 476
 477 int
 478 dm_fail_path(char * mapname, char * path)
 479 {
 480         char message[32];
 481
 482         if (snprintf(message, 32, "fail_path %s\n", path) > 32)
 483                 return 1;
 484
 485         return dm_message(mapname, message);
 486 }
 487
 488 int
 489 dm_reinstate_path(char * mapname, char * path)
 490 {
 491         char message[32];
 492
 493         if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
 494                 return 1;
 495
 496         return dm_message(mapname, message);
 497 }
 498
 499 int
 500 dm_queue_if_no_path(char *mapname, int enable)
 501 {
 502         char *message;
 503
 504         if (enable)
 505                 message = "queue_if_no_path\n";
 506         else
 507                 message = "fail_if_no_path\n";
 508
 509         return dm_message(mapname, message);
 510 }
 511
 512 static int
 513 dm_groupmsg (char * msg, char * mapname, int index)
 514 {
 515         char message[32];
 516
 517         if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
 518                 return 1;
 519
 520         return dm_message(mapname, message);
 521 }
 522
 523 int
 524 dm_switchgroup(char * mapname, int index)
 525 {
 526         return dm_groupmsg("switch", mapname, index);
 527 }
 528
 529 int
 530 dm_enablegroup(char * mapname, int index)
 531 {
 532         return dm_groupmsg("enable", mapname, index);
 533 }
 534
 535 int
 536 dm_disablegroup(char * mapname, int index)
 537 {
 538         return dm_groupmsg("disable", mapname, index);
 539 }
 540
 541 int
 542 dm_get_maps (vector mp, char * type)
 543 {
 544         struct multipath * mpp;
 545         int r = 1;
 546         int info;
 547         struct dm_task *dmt;
 548         struct dm_names *names;
 549         unsigned next = 0;
 550
 551         if (!type || !mp)
 552                 return 1;
 553
 554         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 555                 return 1;
 556
 557         dm_task_no_open_count(dmt);
 558
 559         if (!dm_task_run(dmt))
 560                 goto out;
 561
 562         if (!(names = dm_task_get_names(dmt)))
 563                 goto out;
 564
 565         if (!names->dev) {
 566                 r = 0; /* this is perfectly valid */
 567                 goto out;
 568         }
 569
 570         do {
 571                 info = dm_type(names->name, type);
 572
 573                 if (info <= 0)
 574                         goto next;
 575
 576                 mpp = alloc_multipath();
 577
 578                 if (!mpp)
 579                         goto out;
 580
 581                 mpp->alias = STRDUP(names->name);
 582
 583                 if (!mpp->alias)
 584                         goto out1;
 585
 586                 if (info > 0) {
 587                         if (dm_get_map(names->name, &mpp->size, mpp->params))
 588                                 goto out1;
 589
 590                         if (dm_get_status(names->name, mpp->status))
 591                                 goto out1;
 592
 593                         dm_get_uuid(names->name, mpp->wwid);
 594                         dm_get_info(names->name, &mpp->dmi);
 595                 }
 596
 597                 if (!vector_alloc_slot(mp))
 598                         goto out1;
 599
 600                 vector_set_slot(mp, mpp);
 601                 mpp = NULL;
 602 next:
 603                 next = names->next;
 604                 names = (void *) names + next;
 605         } while (next);
 606
 607         r = 0;
 608         goto out;
 609 out1:
 610         free_multipath(mpp, KEEP_PATHS);
 611 out:
 612         dm_task_destroy (dmt);
 613         return r;
 614 }
 615
 616 extern int
 617 dm_get_name(char *uuid, char *type, char *name)
 618 {
 619         vector vec;
 620         struct multipath *mpp;
 621         int i;
 622
 623         vec = vector_alloc();
 624
 625         if (!vec)
 626                 return 0;
 627
 628         if (dm_get_maps(vec, type)) {
 629                 vector_free(vec);
 630                 return 0;
 631         }
 632
 633         vector_foreach_slot(vec, mpp, i) {
 634                 if (!strcmp(uuid, mpp->wwid)) {
 635                         vector_free(vec);
 636                         strcpy(name, mpp->alias);
 637                         return 1;
 638                 }
 639         }
 640
 641         vector_free(vec);
 642         return 0;
 643 }
 644
 645 int
 646 dm_geteventnr (char *name)
 647 {
 648         struct dm_task *dmt;
 649         struct dm_info info;
 650
 651         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 652                 return 0;
 653
 654         if (!dm_task_set_name(dmt, name))
 655                 goto out;
 656
 657         dm_task_no_open_count(dmt);
 658
 659         if (!dm_task_run(dmt))
 660                 goto out;
 661
 662         if (!dm_task_get_info(dmt, &info)) {
 663                 info.event_nr = 0;
 664                 goto out;
 665         }
 666
 667         if (!info.exists) {
 668                 info.event_nr = 0;
 669                 goto out;
 670         }
 671
 672 out:
 673         dm_task_destroy(dmt);
 674
 675         return info.event_nr;
 676 }
 677
 678 char *
 679 dm_mapname(int major, int minor)
 680 {
 681         char * response = NULL;
 682         const char *map;
 683         struct dm_task *dmt;
 684         int r;
 685         int loop = MAX_WAIT * LOOPS_PER_SEC;
 686
 687         if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
 688                 return NULL;
 689
 690         if (!dm_task_set_major(dmt, major) ||
 691             !dm_task_set_minor(dmt, minor))
 692                 goto bad;
 693
 694         dm_task_no_open_count(dmt);
 695
 696         /*
 697          * device map might not be ready when we get here from
 698          * daemon uev_trigger -> uev_add_map
 699          */
 700         while (--loop) {
 701                 dm_shut_log();
 702                 r = dm_task_run(dmt);
 703                 dm_restore_log();
 704
 705                 if (r)
 706                         break;
 707
 708                 usleep(1000 * 1000 / LOOPS_PER_SEC);
 709         }
 710
 711         if (!r) {
 712                 condlog(0, "%i:%i: timeout fetching map name", major, minor);
 713                 goto bad;
 714         }
 715
 716         map = dm_task_get_name(dmt);
 717         if (map && strlen(map))
 718                 response = STRDUP((char *)dm_task_get_name(dmt));
 719
 720         dm_task_destroy(dmt);
 721         return response;
 722 bad:
 723         dm_task_destroy(dmt);
 724         condlog(0, "%i:%i: error fetching map name", major, minor);
 725         return NULL;
 726 }
 727
 728 int
 729 dm_remove_partmaps (char * mapname)
 730 {
 731         struct dm_task *dmt;
 732         struct dm_names *names;
 733         unsigned next = 0;
 734         char params[PARAMS_SIZE];
 735         unsigned long long size;
 736         char dev_t[32];
 737         int r = 1;
 738
 739         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 740                 return 1;
 741
 742         dm_task_no_open_count(dmt);
 743
 744         if (!dm_task_run(dmt))
 745                 goto out;
 746
 747         if (!(names = dm_task_get_names(dmt)))
 748                 goto out;
 749
 750         if (!names->dev) {
 751                 r = 0; /* this is perfectly valid */
 752                 goto out;
 753         }
 754
 755         if (dm_dev_t(mapname, &dev_t[0], 32))
 756                 goto out;
 757
 758         do {
 759                 if (
 760                     /*
 761                      * if devmap target is "linear"
 762                      */
 763                     (dm_type(names->name, "linear") > 0) &&
 764
 765                     /*
 766                      * and the multipath mapname and the part mapname start
 767                      * the same
 768                      */
 769                     !strncmp(names->name, mapname, strlen(mapname)) &&
 770
 771                     /*
 772                      * and the opencount is 0 for us to allow removal
 773                      */
 774                     !dm_get_opencount(names->name) &&
 775
 776                     /*
 777                      * and we can fetch the map table from the kernel
 778                      */
 779                     !dm_get_map(names->name, &size, &params[0]) &&
 780
 781                     /*
 782                      * and the table maps over the multipath map
 783                      */
 784                     strstr(params, dev_t)
 785                    ) {
 786                                 /*
 787                                  * then it's a kpartx generated partition.
 788                                  * remove it.
 789                                  */
 790                                 condlog(4, "partition map %s removed",
 791                                         names->name);
 792                                 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
 793                    }
 794
 795                 next = names->next;
 796                 names = (void *) names + next;
 797         } while (next);
 798
 799         r = 0;
 800 out:
 801         dm_task_destroy (dmt);
 802         return r;
 803 }
 804
 805 static struct dm_info *
 806 alloc_dminfo (void)
 807 {
 808         return MALLOC(sizeof(struct dm_info));
 809 }
 810
 811 int
 812 dm_get_info (char * mapname, struct dm_info ** dmi)
 813 {
 814         int r = 1;
 815         struct dm_task *dmt = NULL;
 816
 817         if (!mapname)
 818                 return 1;
 819
 820         if (!*dmi)
 821                 *dmi = alloc_dminfo();
 822
 823         if (!*dmi)
 824                 return 1;
 825
 826         if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
 827                 goto out;
 828
 829         if (!dm_task_set_name(dmt, mapname))
 830                 goto out;
 831
 832         dm_task_no_open_count(dmt);
 833
 834         if (!dm_task_run(dmt))
 835                 goto out;
 836
 837         if (!dm_task_get_info(dmt, *dmi))
 838                 goto out;
 839
 840         r = 0;
 841 out:
 842         if (r)
 843                 memset(*dmi, 0, sizeof(struct dm_info));
 844
 845         if (dmt)
 846                 dm_task_destroy(dmt);
 847
 848         return r;
 849 }
 850
 851 int
 852 dm_rename_partmaps (char * old, char * new)
 853 {
 854         struct dm_task *dmt;
 855         struct dm_names *names;
 856         unsigned next = 0;
 857         char buff[PARAMS_SIZE];
 858         unsigned long long size;
 859         char dev_t[32];
 860         int r = 1;
 861
 862         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 863                 return 1;
 864
 865         dm_task_no_open_count(dmt);
 866
 867         if (!dm_task_run(dmt))
 868                 goto out;
 869
 870         if (!(names = dm_task_get_names(dmt)))
 871                 goto out;
 872
 873         if (!names->dev) {
 874                 r = 0; /* this is perfectly valid */
 875                 goto out;
 876         }
 877
 878         if (dm_dev_t(old, &dev_t[0], 32))
 879                 goto out;
 880
 881         do {
 882                 if (
 883                     /*
 884                      * if devmap target is "linear"
 885                      */
 886                     (dm_type(names->name, "linear") > 0) &&
 887
 888                     /*
 889                      * and the multipath mapname and the part mapname start
 890                      * the same
 891                      */
 892                     !strncmp(names->name, old, strlen(old)) &&
 893
 894                     /*
 895                      * and we can fetch the map table from the kernel
 896                      */
 897                     !dm_get_map(names->name, &size, &buff[0]) &&
 898
 899                     /*
 900                      * and the table maps over the multipath map
 901                      */
 902                     strstr(buff, dev_t)
 903                    ) {
 904                                 /*
 905                                  * then it's a kpartx generated partition.
 906                                  * Rename it.
 907                                  */
 908                                 snprintf(buff, PARAMS_SIZE, "%s%s",
 909                                          new, names->name + strlen(old));
 910                                 dm_rename(names->name, buff);
 911                                 condlog(4, "partition map %s renamed",
 912                                         names->name);
 913                    }
 914
 915                 next = names->next;
 916                 names = (void *) names + next;
 917         } while (next);
 918
 919         r = 0;
 920 out:
 921         dm_task_destroy (dmt);
 922         return r;
 923 }
 924
 925 int
 926 dm_rename (char * old, char * new)
 927 {
 928         int r = 0;
 929         struct dm_task *dmt;
 930
 931         if (dm_rename_partmaps(old, new))
 932                 return r;
 933
 934         if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
 935                 return r;
 936
 937         if (!dm_task_set_name(dmt, old))
 938                 goto out;
 939
 940         if (!dm_task_set_newname(dmt, new))
 941                 goto out;
 942
 943         dm_task_no_open_count(dmt);
 944
 945         if (!dm_task_run(dmt))
 946                 goto out;
 947
 948         r = 1;
 949 out:
 950         dm_task_destroy(dmt);
 951         return r;
 952 }